Guggisberg Cheese Inc. is recalling several types of its Colby type cheeses and sizes due to a potential contamination of listeria, which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems.

The affected products were manufactured both by Guggisberg Cheese, Inc. and by Deutsch Kase Haus, LLC under the Guggisberg label, according to the FDA Tuesday. No illnesses have been reported.

The recalled products were manufactured between September 1, 2016 and January 27, 2017. These products were packaged in clear plastic and sold in retail stores at deli counters and deli cases located in Ohio, Indiana, Michigan, Pennsylvania, Kentucky, Illinois, and West Virginia.

Anyone who purchased the products should throw them away or return them immediately.